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1# Copyright 1999-2002 Gentoo Technologies, Inc. 1# Copyright 1999-2011 Gentoo Foundation
2# Distributed under the terms of the GNU General Public License v2 2# Distributed under the terms of the GNU General Public License v2
3# Author Bart Verwilst <verwilst@gentoo.org> 3# $Header: /var/cvsroot/gentoo-x86/eclass/flag-o-matic.eclass,v 1.165 2012/01/14 08:05:32 vapier Exp $
4# /space/gentoo/cvsroot/gentoo-x86/eclass/flag-o-matic.eclass
5ECLASS=flag-o-matic
6 4
5# @ECLASS: flag-o-matic.eclass
6# @MAINTAINER:
7# toolchain@gentoo.org
8# @BLURB: common functions to manipulate and query toolchain flags
9# @DESCRIPTION:
10# This eclass contains a suite of functions to help developers sanely
11# and safely manage toolchain flags in their builds.
12
13if [[ ${___ECLASS_ONCE_FLAG_O_MATIC} != "recur -_+^+_- spank" ]] ; then
14___ECLASS_ONCE_FLAG_O_MATIC="recur -_+^+_- spank"
15
16inherit eutils toolchain-funcs multilib
17
18# {C,CXX,F,FC}FLAGS that we allow in strip-flags
19# Note: shell globs and character lists are allowed
20setup-allowed-flags() {
21 ALLOWED_FLAGS="-pipe"
22 ALLOWED_FLAGS+=" -O -O1 -O2 -Os -mcpu -march -mtune"
23 ALLOWED_FLAGS+=" -fstack-protector -fstack-protector-all"
24 ALLOWED_FLAGS+=" -fbounds-checking -fno-strict-overflow"
25 ALLOWED_FLAGS+=" -fno-PIE -fno-pie -fno-unit-at-a-time"
26 ALLOWED_FLAGS+=" -g -g[0-9] -ggdb -ggdb[0-9] -gstabs -gstabs+"
27 ALLOWED_FLAGS+=" -fno-ident -fpermissive"
28 ALLOWED_FLAGS+=" -W* -w"
29
30 # allow a bunch of flags that negate features / control ABI
31 ALLOWED_FLAGS+=" -fno-stack-protector -fno-stack-protector-all \
32 -fno-strict-aliasing -fno-bounds-checking -fstrict-overflow \
33 -fno-omit-frame-pointer"
34 ALLOWED_FLAGS+=" -mregparm -mno-app-regs -mapp-regs -mno-mmx -mno-sse \
35 -mno-sse2 -mno-sse3 -mno-ssse3 -mno-sse4 -mno-sse4.1 -mno-sse4.2 \
36 -mno-avx -mno-aes -mno-pclmul -mno-sse4a -mno-3dnow -mno-popcnt \
37 -mno-abm -mips1 -mips2 -mips3 -mips4 -mips32 -mips64 -mips16 -mplt \
38 -msoft-float -mno-soft-float -mhard-float -mno-hard-float -mfpu \
39 -mieee -mieee-with-inexact -mschedule -mfloat-gprs -mspe -mno-spe \
40 -mtls-direct-seg-refs -mno-tls-direct-seg-refs -mflat -mno-flat \
41 -mno-faster-structs -mfaster-structs -m32 -m64 -mx32 -mabi \
42 -mlittle-endian -mbig-endian -EL -EB -fPIC -mlive-g0 -mcmodel \
43 -mstack-bias -mno-stack-bias -msecure-plt -m*-toc -D* -U*"
44
45 # 4.5
46 ALLOWED_FLAGS+=" -mno-fma4 -mno-movbe -mno-xop -mno-lwp"
47 # 4.6
48 ALLOWED_FLAGS+=" -mno-fsgsbase -mno-rdrnd -mno-f16c -mno-bmi -mno-tbm"
49
50 export ALLOWED_FLAGS
51 return 0
52}
53
54# inverted filters for hardened compiler. This is trying to unpick
55# the hardened compiler defaults.
56_filter-hardened() {
57 local f
58 for f in "$@" ; do
59 case "${f}" in
60 # Ideally we should only concern ourselves with PIE flags,
61 # not -fPIC or -fpic, but too many places filter -fPIC without
62 # thinking about -fPIE.
63 -fPIC|-fpic|-fPIE|-fpie|-Wl,pie|-pie)
64 gcc-specs-pie || continue
65 is-flagq -nopie || append-flags -nopie;;
66 -fstack-protector)
67 gcc-specs-ssp || continue
68 is-flagq -fno-stack-protector || append-flags $(test-flags -fno-stack-protector);;
69 -fstack-protector-all)
70 gcc-specs-ssp-to-all || continue
71 is-flagq -fno-stack-protector-all || append-flags $(test-flags -fno-stack-protector-all);;
72 -fno-strict-overflow)
73 gcc-specs-nostrict || continue
74 is-flagq -fstrict-overflow || append-flags $(test-flags -fstrict-overflow);;
75 esac
76 done
77}
78
79# Remove occurrences of strings from variable given in $1
80# Strings removed are matched as globs, so for example
81# '-O*' would remove -O1, -O2 etc.
82_filter-var() {
83 local f x VAR VAL
84 declare -a new
85
86 VAR=$1
87 shift
88 eval VAL=\${${VAR}}
89 for f in ${VAL}; do
90 for x in "$@"; do
91 # Note this should work with globs like -O*
92 [[ ${f} == ${x} ]] && continue 2
93 done
94 eval new\[\${\#new\[@]}]=\${f}
95 done
96 eval export ${VAR}=\${new\[*]}
97}
98
99# @FUNCTION: filter-flags
100# @USAGE: <flags>
101# @DESCRIPTION:
102# Remove particular <flags> from {C,CPP,CXX,F,FC,LD}FLAGS. Accepts shell globs.
103filter-flags() {
104 _filter-hardened "$@"
105 local v
106 for v in C CPP CXX F FC LD ; do
107 _filter-var ${v}FLAGS "$@"
108 done
109 return 0
110}
111
112# @FUNCTION: filter-lfs-flags
113# @DESCRIPTION:
114# Remove flags that enable Large File Support.
115filter-lfs-flags() {
116 [[ $# -ne 0 ]] && die "filter-lfs-flags takes no arguments"
117 # http://www.gnu.org/s/libc/manual/html_node/Feature-Test-Macros.html
118 # _LARGEFILE_SOURCE: enable support for new LFS funcs (ftello/etc...)
119 # _LARGEFILE64_SOURCE: enable support for 64bit variants (off64_t/fseeko64/etc...)
120 # _FILE_OFFSET_BITS: default to 64bit variants (off_t is defined as off64_t)
121 filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
122}
123
124# @FUNCTION: append-cppflags
125# @USAGE: <flags>
126# @DESCRIPTION:
127# Add extra <flags> to the current CPPFLAGS.
128append-cppflags() {
129 [[ $# -eq 0 ]] && return 0
130 export CPPFLAGS="${CPPFLAGS} $*"
131 return 0
132}
133
134# @FUNCTION: append-cflags
135# @USAGE: <flags>
136# @DESCRIPTION:
137# Add extra <flags> to the current CFLAGS.
138append-cflags() {
139 [[ $# -eq 0 ]] && return 0
140 export CFLAGS=$(test-flags-CC ${CFLAGS} "$@")
141 return 0
142}
143
144# @FUNCTION: append-cxxflags
145# @USAGE: <flags>
146# @DESCRIPTION:
147# Add extra <flags> to the current CXXFLAGS.
148append-cxxflags() {
149 [[ $# -eq 0 ]] && return 0
150 export CXXFLAGS=$(test-flags-CXX ${CXXFLAGS} "$@")
151 return 0
152}
153
154# @FUNCTION: append-fflags
155# @USAGE: <flags>
156# @DESCRIPTION:
157# Add extra <flags> to the current {F,FC}FLAGS.
158append-fflags() {
159 [[ $# -eq 0 ]] && return 0
160 export FFLAGS=$(test-flags-F77 ${FFLAGS} "$@")
161 export FCFLAGS=$(test-flags-FC ${FCFLAGS} "$@")
162 return 0
163}
164
165# @FUNCTION: append-lfs-flags
166# @DESCRIPTION:
167# Add flags that enable Large File Support.
168append-lfs-flags() {
169 [[ $# -ne 0 ]] && die "append-lfs-flags takes no arguments"
170 # see comments in filter-lfs-flags func for meaning of these
171 append-cppflags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
172}
173
174# @FUNCTION: append-flags
175# @USAGE: <flags>
176# @DESCRIPTION:
177# Add extra <flags> to your current {C,CXX,F,FC}FLAGS.
178append-flags() {
179 [[ $# -eq 0 ]] && return 0
180 append-cflags "$@"
181 append-cxxflags "$@"
182 append-fflags "$@"
183 return 0
184}
185
186# @FUNCTION: replace-flags
187# @USAGE: <old> <new>
188# @DESCRIPTION:
189# Replace the <old> flag with <new>. Accepts shell globs for <old>.
190replace-flags() {
191 [[ $# != 2 ]] \
192 && echo && eerror "Usage: replace-flags <old flag> <new flag>" \
193 && die "replace-flags takes 2 arguments, not $#"
194
195 local f fset
196 declare -a new_CFLAGS new_CXXFLAGS new_FFLAGS new_FCFLAGS
197
198 for fset in CFLAGS CXXFLAGS FFLAGS FCFLAGS; do
199 # Looping over the flags instead of using a global
200 # substitution ensures that we're working with flag atoms.
201 # Otherwise globs like -O* have the potential to wipe out the
202 # list of flags.
203 for f in ${!fset}; do
204 # Note this should work with globs like -O*
205 [[ ${f} == ${1} ]] && f=${2}
206 eval new_${fset}\[\${\#new_${fset}\[@]}]=\${f}
207 done
208 eval export ${fset}=\${new_${fset}\[*]}
209 done
210
211 return 0
212}
213
214# @FUNCTION: replace-cpu-flags
215# @USAGE: <old> <new>
216# @DESCRIPTION:
217# Replace cpu flags (like -march/-mcpu/-mtune) that select the <old> cpu
218# with flags that select the <new> cpu. Accepts shell globs for <old>.
219replace-cpu-flags() {
220 local newcpu="$#" ; newcpu="${!newcpu}"
221 while [ $# -gt 1 ] ; do
222 # quote to make sure that no globbing is done (particularly on
223 # ${oldcpu}) prior to calling replace-flags
224 replace-flags "-march=${1}" "-march=${newcpu}"
225 replace-flags "-mcpu=${1}" "-mcpu=${newcpu}"
226 replace-flags "-mtune=${1}" "-mtune=${newcpu}"
227 shift
228 done
229 return 0
230}
231
232_is_flagq() {
233 local x
234 for x in ${!1} ; do
235 [[ ${x} == $2 ]] && return 0
236 done
237 return 1
238}
239
240# @FUNCTION: is-flagq
241# @USAGE: <flag>
242# @DESCRIPTION:
243# Returns shell true if <flag> is in {C,CXX,F,FC}FLAGS, else returns shell false. Accepts shell globs.
244is-flagq() {
245 [[ -n $2 ]] && die "Usage: is-flag <flag>"
246 _is_flagq CFLAGS $1 || _is_flagq CXXFLAGS $1 || _is_flagq FFLAGS $1 || _is_flagq FCFLAGS $1
247}
248
249# @FUNCTION: is-flag
250# @USAGE: <flag>
251# @DESCRIPTION:
252# Echo's "true" if flag is set in {C,CXX,F,FC}FLAGS. Accepts shell globs.
253is-flag() {
254 is-flagq "$@" && echo true
255}
256
257# @FUNCTION: is-ldflagq
258# @USAGE: <flag>
259# @DESCRIPTION:
260# Returns shell true if <flag> is in LDFLAGS, else returns shell false. Accepts shell globs.
261is-ldflagq() {
262 [[ -n $2 ]] && die "Usage: is-ldflag <flag>"
263 _is_flagq LDFLAGS $1
264}
265
266# @FUNCTION: is-ldflag
267# @USAGE: <flag>
268# @DESCRIPTION:
269# Echo's "true" if flag is set in LDFLAGS. Accepts shell globs.
270is-ldflag() {
271 is-ldflagq "$@" && echo true
272}
273
274# @FUNCTION: filter-mfpmath
275# @USAGE: <math types>
276# @DESCRIPTION:
277# Remove specified math types from the fpmath flag. For example, if the user
278# has -mfpmath=sse,386, running `filter-mfpmath sse` will leave the user with
279# -mfpmath=386.
280filter-mfpmath() {
281 local orig_mfpmath new_math prune_math
282
283 # save the original -mfpmath flag
284 orig_mfpmath=$(get-flag -mfpmath)
285 # get the value of the current -mfpmath flag
286 new_math=$(get-flag mfpmath)
287 new_math=" ${new_math//,/ } "
288 # figure out which math values are to be removed
289 prune_math=""
290 for prune_math in "$@" ; do
291 new_math=${new_math/ ${prune_math} / }
292 done
293 new_math=$(echo ${new_math})
294 new_math=${new_math// /,}
295
296 if [[ -z ${new_math} ]] ; then
297 # if we're removing all user specified math values are
298 # slated for removal, then we just filter the flag
299 filter-flags ${orig_mfpmath}
300 else
301 # if we only want to filter some of the user specified
302 # math values, then we replace the current flag
303 replace-flags ${orig_mfpmath} -mfpmath=${new_math}
304 fi
305 return 0
306}
307
308# @FUNCTION: strip-flags
309# @DESCRIPTION:
310# Strip C[XX]FLAGS of everything except known good/safe flags.
311strip-flags() {
312 local x y flag NEW_CFLAGS NEW_CXXFLAGS NEW_FFLAGS NEW_FCFLAGS
313
314 setup-allowed-flags
315
316 local NEW_CFLAGS=""
317 local NEW_CXXFLAGS=""
318 local NEW_FFLAGS=""
319 local NEW_FCFLAGS=""
320
321 set -f # disable pathname expansion
322
323 for x in ${CFLAGS}; do
324 for y in ${ALLOWED_FLAGS}; do
325 flag=${x%%=*}
326 if [ "${flag%%${y}}" = "" ] ; then
327 NEW_CFLAGS="${NEW_CFLAGS} ${x}"
328 break
329 fi
330 done
331 done
332
333 for x in ${CXXFLAGS}; do
334 for y in ${ALLOWED_FLAGS}; do
335 flag=${x%%=*}
336 if [ "${flag%%${y}}" = "" ] ; then
337 NEW_CXXFLAGS="${NEW_CXXFLAGS} ${x}"
338 break
339 fi
340 done
341 done
342
343 for x in ${FFLAGS}; do
344 for y in ${ALLOWED_FLAGS}; do
345 flag=${x%%=*}
346 if [ "${flag%%${y}}" = "" ] ; then
347 NEW_FFLAGS="${NEW_FFLAGS} ${x}"
348 break
349 fi
350 done
351 done
352
353 for x in ${FCFLAGS}; do
354 for y in ${ALLOWED_FLAGS}; do
355 flag=${x%%=*}
356 if [ "${flag%%${y}}" = "" ] ; then
357 NEW_FCFLAGS="${NEW_FCFLAGS} ${x}"
358 break
359 fi
360 done
361 done
362
363 # In case we filtered out all optimization flags fallback to -O2
364 if [ "${CFLAGS/-O}" != "${CFLAGS}" -a "${NEW_CFLAGS/-O}" = "${NEW_CFLAGS}" ]; then
365 NEW_CFLAGS="${NEW_CFLAGS} -O2"
366 fi
367 if [ "${CXXFLAGS/-O}" != "${CXXFLAGS}" -a "${NEW_CXXFLAGS/-O}" = "${NEW_CXXFLAGS}" ]; then
368 NEW_CXXFLAGS="${NEW_CXXFLAGS} -O2"
369 fi
370 if [ "${FFLAGS/-O}" != "${FFLAGS}" -a "${NEW_FFLAGS/-O}" = "${NEW_FFLAGS}" ]; then
371 NEW_FFLAGS="${NEW_FFLAGS} -O2"
372 fi
373 if [ "${FCFLAGS/-O}" != "${FCFLAGS}" -a "${NEW_FCFLAGS/-O}" = "${NEW_FCFLAGS}" ]; then
374 NEW_FCFLAGS="${NEW_FCFLAGS} -O2"
375 fi
376
377 set +f # re-enable pathname expansion
378
379 export CFLAGS="${NEW_CFLAGS}"
380 export CXXFLAGS="${NEW_CXXFLAGS}"
381 export FFLAGS="${NEW_FFLAGS}"
382 export FCFLAGS="${NEW_FCFLAGS}"
383 return 0
384}
385
386test-flag-PROG() {
387 local comp=$1
388 local flags="$2"
389
390 [[ -z ${comp} || -z ${flags} ]] && return 1
391
392 # use -c so we can test the assembler as well
393 local PROG=$(tc-get${comp})
394 ${PROG} ${flags} -c -o /dev/null -xc /dev/null \
395 > /dev/null 2>&1
396}
397
398# @FUNCTION: test-flag-CC
399# @USAGE: <flag>
400# @DESCRIPTION:
401# Returns shell true if <flag> is supported by the C compiler, else returns shell false.
402test-flag-CC() { test-flag-PROG "CC" "$1"; }
403
404# @FUNCTION: test-flag-CXX
405# @USAGE: <flag>
406# @DESCRIPTION:
407# Returns shell true if <flag> is supported by the C++ compiler, else returns shell false.
408test-flag-CXX() { test-flag-PROG "CXX" "$1"; }
409
410# @FUNCTION: test-flag-F77
411# @USAGE: <flag>
412# @DESCRIPTION:
413# Returns shell true if <flag> is supported by the Fortran 77 compiler, else returns shell false.
414test-flag-F77() { test-flag-PROG "F77" "$1"; }
415
416# @FUNCTION: test-flag-FC
417# @USAGE: <flag>
418# @DESCRIPTION:
419# Returns shell true if <flag> is supported by the Fortran 90 compiler, else returns shell false.
420test-flag-FC() { test-flag-PROG "FC" "$1"; }
421
422test-flags-PROG() {
423 local comp=$1
424 local flags
425 local x
426
427 shift
428
429 [[ -z ${comp} ]] && return 1
430
431 for x in "$@" ; do
432 test-flag-${comp} "${x}" && flags="${flags}${flags:+ }${x}"
433 done
434
435 echo "${flags}"
436
437 # Just bail if we dont have any flags
438 [[ -n ${flags} ]]
439}
440
441# @FUNCTION: test-flags-CC
442# @USAGE: <flags>
443# @DESCRIPTION:
444# Returns shell true if <flags> are supported by the C compiler, else returns shell false.
445test-flags-CC() { test-flags-PROG "CC" "$@"; }
446
447# @FUNCTION: test-flags-CXX
448# @USAGE: <flags>
449# @DESCRIPTION:
450# Returns shell true if <flags> are supported by the C++ compiler, else returns shell false.
451test-flags-CXX() { test-flags-PROG "CXX" "$@"; }
452
453# @FUNCTION: test-flags-F77
454# @USAGE: <flags>
455# @DESCRIPTION:
456# Returns shell true if <flags> are supported by the Fortran 77 compiler, else returns shell false.
457test-flags-F77() { test-flags-PROG "F77" "$@"; }
458
459# @FUNCTION: test-flags-FC
460# @USAGE: <flags>
461# @DESCRIPTION:
462# Returns shell true if <flags> are supported by the Fortran 90 compiler, else returns shell false.
463test-flags-FC() { test-flags-PROG "FC" "$@"; }
464
465# @FUNCTION: test-flags
466# @USAGE: <flags>
467# @DESCRIPTION:
468# Short-hand that should hopefully work for both C and C++ compiler, but
469# its really only present due to the append-flags() abomination.
470test-flags() { test-flags-CC "$@"; }
471
472# @FUNCTION: test_version_info
473# @USAGE: <version>
474# @DESCRIPTION:
475# Returns shell true if the current C compiler version matches <version>, else returns shell false.
476# Accepts shell globs.
477test_version_info() {
478 if [[ $($(tc-getCC) --version 2>&1) == *$1* ]]; then
479 return 0
480 else
481 return 1
482 fi
483}
484
485# @FUNCTION: strip-unsupported-flags
486# @DESCRIPTION:
487# Strip {C,CXX,F,FC}FLAGS of any flags not supported by the active toolchain.
488strip-unsupported-flags() {
489 export CFLAGS=$(test-flags-CC ${CFLAGS})
490 export CXXFLAGS=$(test-flags-CXX ${CXXFLAGS})
491 export FFLAGS=$(test-flags-F77 ${FFLAGS})
492 export FCFLAGS=$(test-flags-FC ${FCFLAGS})
493}
494
495# @FUNCTION: get-flag
496# @USAGE: <flag>
497# @DESCRIPTION:
498# Find and echo the value for a particular flag. Accepts shell globs.
499get-flag() {
500 local f findflag="$1"
501
502 # this code looks a little flaky but seems to work for
503 # everything we want ...
504 # for example, if CFLAGS="-march=i686":
505 # `get-flag -march` == "-march=i686"
506 # `get-flag march` == "i686"
507 for f in ${CFLAGS} ${CXXFLAGS} ${FFLAGS} ${FCFLAGS} ; do
508 if [ "${f/${findflag}}" != "${f}" ] ; then
509 printf "%s\n" "${f/-${findflag}=}"
510 return 0
511 fi
512 done
513 return 1
514}
515
516# @FUNCTION: has_m64
517# @DESCRIPTION:
518# This doesn't test if the flag is accepted, it tests if the flag actually
519# WORKS. Non-multilib gcc will take both -m32 and -m64. If the flag works
520# return code is 0, else the return code is 1.
521has_m64() {
522 # this doesnt test if the flag is accepted, it tests if the flag
523 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
524 # please dont replace this function with test_flag in some future
525 # clean-up!
526
527 local temp="$(emktemp)"
528 echo "int main() { return(0); }" > "${temp}".c
529 MY_CC=$(tc-getCC)
530 ${MY_CC/ .*/} -m64 -o "$(emktemp)" "${temp}".c > /dev/null 2>&1
531 local ret=$?
532 rm -f "${temp}".c
533 [[ ${ret} != 1 ]] && return 0
534 return 1
535}
536
537# @FUNCTION: has_m32
538# @DESCRIPTION:
539# This doesn't test if the flag is accepted, it tests if the flag actually
540# WORKS. Non-mulilib gcc will take both -m32 and -64. If the flag works return
541# code is 0, else return code is 1.
542has_m32() {
543 # this doesnt test if the flag is accepted, it tests if the flag
544 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
545 # please dont replace this function with test_flag in some future
546 # clean-up!
547
548 [ "$(tc-arch)" = "amd64" ] && has_multilib_profile && return 0
549
550 local temp=$(emktemp)
551 echo "int main() { return(0); }" > "${temp}".c
552 MY_CC=$(tc-getCC)
553 ${MY_CC/ .*/} -m32 -o "$(emktemp)" "${temp}".c > /dev/null 2>&1
554 local ret=$?
555 rm -f "${temp}".c
556 [[ ${ret} != 1 ]] && return 0
557 return 1
558}
559
560# @FUNCTION: replace-sparc64-flags
561# @DESCRIPTION:
562# Sets mcpu to v8 and uses the original value as mtune if none specified.
563replace-sparc64-flags() {
564 local SPARC64_CPUS="ultrasparc3 ultrasparc v9"
565
566 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]; then
567 for x in ${SPARC64_CPUS}; do
568 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
569 done
570 else
571 for x in ${SPARC64_CPUS}; do
572 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
573 done
574 fi
575
576 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]; then
577 for x in ${SPARC64_CPUS}; do
578 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
579 done
580 else
581 for x in ${SPARC64_CPUS}; do
582 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
583 done
584 fi
585
586 export CFLAGS CXXFLAGS
587}
588
589# @FUNCTION: append-libs
590# @USAGE: <libs>
591# @DESCRIPTION:
592# Add extra <libs> to the current LIBS.
593append-libs() {
594 [[ $# -eq 0 ]] && return 0
595 local flag
596 for flag in "$@"; do
597 [[ ${flag} == -l* ]] && flag=${flag#-l}
598 export LIBS="${LIBS} -l${flag}"
599 done
600
601 return 0
602}
603
604# @FUNCTION: append-ldflags
605# @USAGE: <flags>
606# @DESCRIPTION:
607# Add extra <flags> to the current LDFLAGS.
608append-ldflags() {
609 [[ $# -eq 0 ]] && return 0
610 local flag
611 for flag in "$@"; do
612 [[ ${flag} == -l* ]] && \
613 ewarn "Appending a library link instruction (${flag}); libraries to link to should not be passed through LDFLAGS"
614 done
615
616 export LDFLAGS="${LDFLAGS} $*"
617 return 0
618}
619
620# @FUNCTION: filter-ldflags
621# @USAGE: <flags>
622# @DESCRIPTION:
623# Remove particular <flags> from LDFLAGS. Accepts shell globs.
624filter-ldflags() {
625 _filter-var LDFLAGS "$@"
626 return 0
627}
628
629# @FUNCTION: raw-ldflags
630# @USAGE: [flags]
631# @DESCRIPTION:
632# Turn C style ldflags (-Wl,-foo) into straight ldflags - the results
633# are suitable for passing directly to 'ld'; note LDFLAGS is usually passed
634# to gcc where it needs the '-Wl,'.
7# 635#
8#### filter-flags <flag> #### 636# If no flags are specified, then default to ${LDFLAGS}.
9# Remove particular flags from C[XX]FLAGS 637raw-ldflags() {
10# 638 local x input="$@"
11#### append-flags <flag> #### 639 [[ -z ${input} ]] && input=${LDFLAGS}
12# Add extra flags to your current C[XX]FLAGS 640 set --
13#
14#### change-flags <orig.flag> <new.flag> ###
15# Replace a flag by another one
16#
17
18
19filter-flags () {
20
21 for x in $1; do 641 for x in ${input} ; do
22 CFLAGS="${CFLAGS/$x}" 642 x=${x#-Wl,}
23 CXXFLAGS="${CXXFLAGS/$x}" 643 set -- "$@" ${x//,/ }
24 done 644 done
25 645 echo "$@"
26} 646}
27 647
28append-flags () { 648# @FUNCTION: no-as-needed
29 649# @RETURN: Flag to disable asneeded behavior for use with append-ldflags.
30 650no-as-needed() {
31 CFLAGS="$CFLAGS $1" 651 case $($(tc-getLD) -v 2>&1 </dev/null) in
32 CXXFLAGS="$CXXFLAGS $1" 652 *GNU*) # GNU ld
33 653 echo "-Wl,--no-as-needed" ;;
654 esac
34} 655}
35 656
36change-flags () { 657fi
37
38 CFLAGS="${CFLAGS/${1}/${2}"
39 CXXFLAGS="${CXXFLAGS/${1}/${2}"
40
41}

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